vim

local tArgs = {...}
local filename = tArgs[1]
if not filename then
  print("Usage: \"vim <file>\"")
  return
end

local styles = {
  text = {
    bg = colors.black,
    fg = colors.white,
  },
  infobar = {
    bg = colors.lightGray,
    fg = colors.black,
  },
}

local modes = {
  [0] = " ", --normal
  [1] = " -- INSERT --",
  [2] = ":", --command
  [3] = " -- VISUAL --",
  [4] = " -- REPLACE --",
}

local state = {
  mode = 0, -- editor mode, see modes above
  modified = false, --if the file was changed
  scroll = {x=0,y=0,}, --the editor offset
  cursor = {x=1,y=1,}, --cursor position in file
  cmd = "", --current command, used in mode 2
}

function style(name)
  term.setBackgroundColor(styles[name].bg)
  term.setTextColor(styles[name].fg)
end

function infoBar(y)
  --info line 1
  style("infobar")
  term.setCursorPos(1,y)
  term.clearLine()
  ---file name
  term.write(" ["..filename.."]")
  ---file modified
  term.write((state.modified) and "[+]" or "[ ]")
  ---cursor position
  local posStr = state.cursor.y..","..state.cursor.x
  local tX = term.getSize()
  term.setCursorPos(tX-string.len(posStr),y)
  term.write(posStr)
  --info line 2
  style("text")
  term.setCursorPos(1,y+1)
  term.clearLine()
  ---write mode string
  term.write(modes[state.mode])
  ---write command if in command mode
  if state.mode == 2 then
    term.write(state.cmd)
  end
end

function draw()
  local tX,tY = term.getSize()
  infoBar(tY-1)
end

local tmpx,tmpy=term.getCursorPos()
draw()
term.setCursorPos(tmpx,tmpy)